悬索桥张拉锚跨索股施工控制技术

针对悬索桥张拉锚跨索股纠偏索塔偏位的新施工工艺,利用悬索桥主缆无应力长度不变的原则,确定锚跨索股张拉预留量的计算方法;根据悬索桥施工控制理论和有限元程序,研究分阶段分批张拉锚跨索股施工控制技术。结果表明:施工过程中应将各索股之间的应力差控制在150MPa以内,塔顶相对偏位控制在5 cm以内,经过循环张拉后,成桥阶段各索股实测索力与理论索力差值的最大值占理论索力的5%,索力均匀;施工过程中确定的锚跨索股预留量为53 cm,该预留量的计算方法简单、准确。

Construction control technique for suspension bridge built by drawing anchorage cable

Directed toward a new construction craft,drawing anchorage cable to rectify the offset of the tower of suspension bridge,based on the principle of invariable zero-stress cable length,a method of calculation of pre-allowance of the drawing anchorage cable is determined.Based on the structural control theory of suspension bridge by finite element program,the control technique for drawing anchorage cable is studied.The application result expresses that: the difference value of every cable's stress should be controlled under 150 MPa,and horizon deviation of main towers should be controlled under 5 cm;after having tensioned several times,the cable's tension become well distributed;the ratio of the maximum difference value of every cable's tension between theory and actual measurement to theoretic tension is less than 5%;during the construction of the bridge,the obligated deviation of towers is 53 cm,the method of calculating the obligated deviation is simple and accurate.1 tab,4 figs,9 refs.